Re: [ATM] Paper tube?

[Aki Lötjönen <aki.lotjonen@phnet.fi>]

Hi Ukyo,

Paper tubes are normally ok if you also make it little bit stronger by
gluing, for example, a thin plywood around it. I installed a small
Dall-Kirham Cassegrain optics in that kind of tube (paper tube wall
thickness 4 mm, plywood 2 mm) and it works quite ok. If your wall
thickness is only 1 mm, it sounds pretty thin to me.
My LHN telescope has now a PVC plastic tube which I'll definetely change
to another type...

Regards,
Aki Lötjönen




> Hi list,
> 
> I am working on the tube for the coming 127mm LH system lenses.
> I had thought about to use Aluminium tube but the cost of material and 
> manufacture 1 set is too high, so I turned to paper tube now, not sure if 
> normal industrial paper tube is strong enough for a such aperture like 
> 127mm. Existing industrial paper tube can be offered in some diameters like 
> 125, 135mm and the thickness should be 1mm. Also they are very cheap, I can 
> easily rebuild one if something failed.
> Thanks for any sugguestion.
> 
> Best Regards,
> Ukyo Chen
> 
> 
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